Optically active N-heterocycles with four-, five-, or six-membered rings can be prepared from unsaturated secondary amines, by using a one-pot hydrozirconation/iodination sequence as the key step. The presented method allows the preparation of 2-substituted pyrrolidines enantiomeric to those previously obtained from N-allyloxazolidines. The two approaches use the same reagents (allyl bromide and aldehydes) and the same (R)-2-phenylglycinol as the chiral inductor.
具有四元环、五元环或六元环的光活性N-
杂环化合物,可以通过从不饱和仲胺出发、利用一锅法进行的
氢锆化/
碘化反应序列作为关键步骤来制备。本文介绍的方法可用于制备与从N-
烯丙基
噁唑啉获得的2-取代
吡咯烷相反的非对映异构体。这两种方法使用了相同的试剂(
烯丙基
溴和醛)以及相同的(R)-2-
苯基甘
氨醇作为手性诱导剂。